Executing pfiles will return a list of all descriptors utilized by the process
We are interested in the S_IFREG entries since they are pointing usually to files
In the line, there is the inode number of the file which we use in order to find the filename.
The only bad thing is that in order not to search from / you have to suspect where could possibly be the file.
Improvements more than welcome.
lsof was not available in my case
Show Sample Output

A potential source of a full filesystem are large files left open but have been deleted. On Linux, a file may be deleted (removed/unlinked) while a process has it open. When this happens, the file is essentially invisible to other processes, but it still takes on physical space on the drive. Tools like du will not see it.

I have come across a situation in the past where someone has unlinked a file by running an 'rm' command against it while it was still being written to by a running process.
The problem manifested itself when a 'df' command showed a filesystem at 100%, but this did not match the total value of a 'du -sk *'.
When this happens, the process continues to write to the file but you can no longer see the file on the filesystem. Stopping and starting the process will, more often than not, get rid of the unlinked file, however this is not always possible on a live server.
When you are in this situation you can use the 'lsof' command above to get the PID of the process that owns the file (in the sample output this is 23521).
Run the following command to see a sym-link to the file (marked as deleted):
cd /proc/23521/fd && ls -l
Truncate the sym-link to regain your disk space:
> /proc/23521/fd/3
I should point out that this is pretty brutal and *could* potentially destabilise your system depending on what process the file belongs to that you are truncating.
Show Sample Output

What Others Think

OK, this command is much too long :-)
.
First, "ps | grep | grep -v grep"... you'd be better using pgrep or pidof
pgrep node
.
Next you use xargs and awk to join up the numbers into one line.
paste will do that for you with a choice of separators
... | paste -s -d\|
-s means "serial" (on one line)
-d delimiter of | (escaped with a backslash)
.
Then, change grep to -E to use extended regex syntax
(this means we can search for (1234|4567) without backslashes.
.
The final command looks like:
lsof -i -n -P | grep -E "($(pgrep node | paste -s -d\|))"

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